JP4237889B2 - Camera shutter - Google Patents

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Publication number
JP4237889B2
JP4237889B2 JP26133399A JP26133399A JP4237889B2 JP 4237889 B2 JP4237889 B2 JP 4237889B2 JP 26133399 A JP26133399 A JP 26133399A JP 26133399 A JP26133399 A JP 26133399A JP 4237889 B2 JP4237889 B2 JP 4237889B2
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Japan
Prior art keywords
sector
energization
data
coil
accordance
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JP26133399A
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JP2001083568A (en
Inventor
宏之 水上
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Seiko Precision Inc
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Seiko Precision Inc
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Priority to JP26133399A priority Critical patent/JP4237889B2/en
Priority to DE10045155A priority patent/DE10045155A1/en
Priority to US09/663,879 priority patent/US6491450B1/en
Publication of JP2001083568A publication Critical patent/JP2001083568A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/08—Shutters
    • G03B9/10—Blade or disc rotating or pivoting about axis normal to its plane
    • G03B9/14—Two separate members moving in opposite directions

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Description

【０００１】
【発明の技術分野】
本発明は、アクチュエーターによりセクタを開閉作動するカメラ用シャッタに関する。
【０００２】
【従来の技術】
コイルへの通電により、永久磁石からなるロータを回転するアクチュエーターを有し、このアクチュエーターにより駆動されるセクタによって開口を開閉するカメラ用シャッタにおいては、セクタが全開した位置又は完全に閉じた位置では、ロータ及びセクタ等の慣性のため、いわゆるバウンド現象が生じることが知られている。セクタにバウンドが生じると全開後にシャッタ開口内にセクタの一部が現れたり、閉じた後に再露光が行われる等の不具合が生じる。
このため、従来はセクタのバウンドの影響が開口内に現れないように、予めセクタを余分に開くようにしたり、必要以上に深く閉じるようにしてこのような不具合を解決していた。
【０００３】
【発明が解決しようとする課題】
従来の解決方法によると、セクタを余分に開く分だけシャッタの外径が大きくなり、シャッタの小型化が困難になる問題があった。また、シャッタ全開後に、セクタのバウンドによって閉じ作動に移るべきタイミングに乱れが生じ正常な露出作動に支障を生じることがあった。
【０００４】
【課題を解決するための手段】
上記課題を解決するために、往復回動によりシャッタ開口を開閉するセクタと、コイルへの正逆通電によりロータを正逆回転させて前記セクタを往復回動せしめるアクチュエーターと、前記アクチュエーター及び前記セクタの作動特性に対応した前記コイルの通電データが記憶してあるメモリ回路と、被写体輝度に応じて前記コイルへの通電を制御し前記被写体輝度に応じた露光制御を行う制御回路とを備え、前記通電データは、ある方向に前記セクタを駆動させるデータと、前記セクタの全開又は全閉位置におけるバウンド動作に対応した前記ある方向とは逆方向に前記セクタに力がかかる制動パルスデータとを有し、前記制動パルスデータは、前記セクタの全開又は全閉位置の直前で、前記ある方向とは逆方向に通電し、その後前記ある方向に通電する正逆方向に交互に通電するデータであり、前記制御回路は、前記被写体輝度に応じて前記メモリ回路から特定の通電データを読み出してコイル通電を制御する制御信号を出力することを特徴としている。このためにセクタのバウンドを減少することができ、セクタのバウンドの影響がなく正確なタイミングでセクタを閉鎖作動に移行することが可能であり、高精度の露出制御が達成できる。
また、往復回動によりシャッタ開口を開閉するセクタと、コイルへの正逆通電によりロータを正逆回転させて前記セクタを往復回動せしめるアクチュエーターと、前記アクチュエーター及び前記セクタの作動特性に対応した前記コイルの通電データが記憶してあるメモリ回路と、被写体輝度に応じて前記コイルへの通電を制御し前記被写体輝度に応じた露光制御を行う制御回路とを備え、前記通電データは、ある方向に前記セクタを駆動させるデータと、前記セクタの全開又は全閉位置におけるバウンド動作に対応した前記ある方向と同一方向に前記セクタに力がかかる制動パルスデータとを有し、前記制動パルスデータは、前記バウンド動作時に、前記ある方向と同一方向に通電するデータであり、前記制御回路は、前記被写体輝度に応じて前記メモリ回路から特定の通電データを読み出してコイル通電を制御する制御信号を出力することを特徴とするカメラ用シャッタであっても上記課題を解決することができる。
【０００５】
【発明の実施の形態】
往復回動によりシャッタ開口を開閉するセクタと、コイルへの正逆通電によりロータを正逆回転させてセクタを往復回動せしめるアクチュエーターと、アクチュエーター及びセクタの作動特性に対応したコイルの通電データが記憶してあるメモリ回路と、被写体輝度に応じてコイルへの通電を制御し被写体輝度に応じた露光制御を行う制御回路とを備え、通電データは、ある方向にセクタを駆動させるデータと、セクタの停止位置におけるバウンド動作に対応した前記ある方向と同一方向にセクタに力がかかる制動パルスデータを有するように設定してあり、制御回路は、被写体輝度に応じてメモリ回路から特定の通電データを読み出してコイル通電を制御する制御信号を出力することとした。
【０００６】
【実施例】
本発明の一実施例について図面を参照して説明する。図１において、ステータ９とロータ１０とコイルＬとはアクチュエーターであるスイングモータＭを構成しており、ステータ９にはコイルＬが巻回されたコイルボビンＬ１が設けられ、このコイルＬへの通電により、ステータ９の極部９ａ、９ｂにＮ極、Ｓ極が発生する。通電方向を変えることによりロータ１０は正逆両方向に回転することができる。
【０００７】
このスイングモータＭの回転により駆動されるセクタ２３，２４は、シャッタ開口２に対して対称的に配置されている。セクタ２４は図示されない地板に突設した軸２５を中心に回動可能に支持されており、セクタ２３は地板に突設した軸２２を中心に回動可能に支持されている。セクタ２３の上面には、セクタ開閉レバー２０が軸２２を中心に回動可能に支持されている。セクタ開閉レバー２０の腕部２０ｂには、ばね２０ｄが設けられ時計回り方向にセクタ開閉レバー２０を付勢している。セクタ開閉レバー２０は地板に設けられたピン２１に当接して、それ以上の回転を制限される。セクタ開閉レバー２０の一端に設けられているピン２０ａは、セクタ２３に係合しており、且つセクタ２４の溝部２４ａと係合してセクタ２３，２４を駆動するようになっている。セクタ開閉レバー２０の他端（図面下側）には、フォーク部２０ｃが設けられており、後述するロータ作動レバー１１のピン１１ｂと係合している。
【０００８】
ロータ１０の回転軸１０ａにはロータ作動レバー１１が圧入固定されており、このロータ作動レバー１１はロータ１０と一体的に回動する。ロータ作動レバー１１の一端に設けられているピン１１ｂは、セクタ開閉レバー２０と係合している。このため、ロータ１０が時計回りに回動するとロータ作動レバー１１も時計回り方向に回動し、このロータ作動レバー１１の回動によりセクタ開閉レバー２０を反時計回り方向に回動させ、セクタ２３，２４を作動させることができる。ロータ１０の回動は、カメラ本体内に設けられているモータ駆動部８にて行う。モータ駆動部８は制御回路７からの通電データを受け取ってロータ１０を回動させる。制御回路７はＩＳＯ情報読み取り回路２７からのフィルム感度情報や測光部２６からの被写体の輝度情報等の情報を読み取り露光量を決定し、この露光量に対応するロータ１０の作動のための通電時間、通電方向の通電データをメモリ回路５から読み込む。
【０００９】
このようなモータ制御シャッタ装置の作用について次に説明する。図１は、シャッタ作動前の状態であり、まず、図２に示すカメラのレリーズボタン６が押圧操作されると制御回路７によりモータ駆動部８を介して図１に示すコイルＬに通電する。コイルＬへの通電により、まずステータ９の極部９ａにＳ極、極部９ｂにＮ極が発生しロータ１０が時計回り方向に回動する。この回動によりロータ１０に圧入固定されたロータ作動レバー１１も軸１１ａを中心として時計回り方向に回動するので、ピン１１ｂが時計回り方向に回動することにより、セクタ開閉レバー２０を反時計回り方向に回動させる。それに伴いセクタ開閉レバー２０に備えてあるピン２０ａを介して２枚のセクタ２３，２４が互いに反対方向に回動して露出開口が形成され始める。
セクタ２３，２４は図２に示す測光部２６からの被写体の輝度情報、フィルム感度のＩＳＯ情報２７等により、制御回路７において決定された露出位置まで回動し、その後、コイルＬに逆方向通電が行われ逆転（反時計回り方向の回転）して露出を終了し、図１の状態に戻る。
【００１０】
この場合に、制御回路７で決定された露光量に対応してモータ駆動部８を制御すべき通電データがメモリ回路５から出力される。すなわち、その通電データはロータ１０及びセクタ開閉レバー２０さらにセクタ２３，２４の慣性を考慮したものである。さらにセクタ２３，２４が全開位置に達した後に、前記慣性に起因するバウンドがセクタ２３，２４に生じないように全開位置に達する直前で逆方向に通電し、その後正方向に通電するような正逆方向に交互に通電するデータとなっている。
【００１１】
図３は、コイルＬへの通電データをセクタ２３，２４の開放運動と対応して説明するものである。図３（ｂ）はコイルＬへの通電状態を示し、横軸は経過時間、縦軸は通電方向をそれぞれ示している。図３（ａ）と（ｂ）とは経過時間を対応させてある。
図３に示すように、時刻ｔ１でコイルＬに正方向通電が開始されると、ロータ１０が時計方向に回転し、前述のようにセクタ２３，２４を開放作動（Ｔ１区間）する。そして、セクタ２３，２４が全開位置（Ｔ２区間）に到達する直前の時刻ｔ２でコイルＬには制動パルスが与えられ逆方向の通電が短時間行われる。そのため、本来は、点線で示すようにセクタ２３，２４がオーバーランしていたがコイルＬへの逆方向通電により、ステータ９の磁極９ａ，９ｂには逆磁界が発生して、ロータ１０を強制的に静動するように作用する。
【００１２】
そのために、セクタ２３，２４は実線のように大きくオーバーランすることがない。その後同様に、セクタ２３，２４の運動方向に合わせて、それぞれ逆方向にロータ１０を作動するように時刻ｔ３，ｔ４で図３（ｂ）のような制動パルスが与えられ正逆方向に、かつ交互に短時間通電を行う。この時刻ｔ２，ｔ３，ｔ４は、シャッタ型式毎に定まるもので略一様に設定できるためメモリ回路５の通電データはシャッタ型式毎に一律に規定することができる。
【００１３】
また、セクタ２３，２４が閉鎖作動（Ｔ３区間）を終了する際にもロータ１０及びセクタ２３，２４が急速に停止するため、同様のバウンドが生じる。そこで本発明では、逆方向通電による閉鎖作動（Ｔ３区間）の完了直前の時刻ｔ６で制動パルスが与えられ正方向の短時間通電が行われる。この後同様に、セクタ２３，２４の運動方向に合わせて、それぞれ逆方向にロータ１０を作動するように制動パルスが与えられ時刻ｔ７，ｔ８，ｔ９で図３（ｂ）のような正逆方向に、かつ交互に短時間の通電を行う。そして、セクタ２３，２４は本来なら点線のように作動すべきところ、実線のように修正された作動をする。
【００１４】
本実施例では、アクチュエーターはスイングモータを使用したが、ステップモータや超音波モータ等の往復回動できるモータであれば適用可能である。また、セクタ開時には時刻ｔ２，ｔ３，ｔ４、セクタ閉時には時刻ｔ６，ｔ７，ｔ８，ｔ９とバウンド方向とは逆方向にロータを回転させる通電を行ったが、セクタがバウンドして進行方向とは逆方向に戻ってきてしまうことが問題となることが多いので、時刻ｔ３，ｔ７，ｔ９で行うセクタの進行方向に通電させる制動パルスのみを与えるようにしても良い。
【発明の効果】
本発明のシャッタは以上のような構成であるから、開放運動及び閉鎖運動により生ずるバウンドを予定したセクタの余分な運動スペースが削減されシャッタの小型化が実現できる。
また、セクタが早期に安定するため露出終了のための正規の通電に移行する際に、セクタのバウンドの影響がなく正確なタイミングでセクタを閉鎖作動に移行することが可能であり、高精度の露出制御が達成できる。
【図面の簡単な説明】
【図１】本発明による一実施例を示すカメラ用シャッタの初期状態を示す平面図である。
【図２】本発明による一実施例を示すカメラ用シャッタの構成図である。
【図３】本発明の一実施例の開口状態とコイルの通電状態を示すグラフである。
【符号の説明】
２ シャッタ開口
５ メモリ回路
７ 制御回路
１０ ロータ
２３，２４ セクタ
Ｌ コイル
Ｍ アクチュエーター[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera shutter that opens and closes a sector by an actuator.
[0002]
[Prior art]
In a camera shutter that has an actuator that rotates a rotor made of a permanent magnet by energizing a coil and opens and closes an opening by a sector driven by this actuator, at a position where the sector is fully opened or completely closed, It is known that a so-called bounce phenomenon occurs due to the inertia of the rotor and the sector. When the sector bounces, a part of the sector appears in the shutter opening after full opening, or re-exposure is performed after closing.
For this reason, conventionally, such inconveniences have been solved by opening the sectors in advance or closing them more deeply than necessary so that the influence of sector bounds does not appear in the opening.
[0003]
[Problems to be solved by the invention]
According to the conventional solution, there is a problem that the outer diameter of the shutter is increased by an extra opening of the sector, and it is difficult to reduce the size of the shutter. In addition, after the shutter is fully opened, the timing for moving to the closing operation may be disturbed due to the bounce of the sector, and the normal exposure operation may be hindered.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, a sector that opens and closes the shutter opening by reciprocating rotation, an actuator that rotates the rotor forward and backward by forward and reverse energization to the coil, and reciprocally rotates the sector, and the actuator and the sector A memory circuit storing energization data of the coil corresponding to operating characteristics; and a control circuit for controlling energization to the coil in accordance with subject brightness and performing exposure control in accordance with the subject brightness. The data includes data for driving the sector in a certain direction, and braking pulse data for applying a force to the sector in a direction opposite to the certain direction corresponding to the bound operation in the fully open or fully closed position of the sector, The braking pulse data is energized in a direction opposite to the certain direction immediately before the fully open or fully closed position of the sector, and thereafter The control circuit reads out specific energization data from the memory circuit according to the subject brightness and outputs a control signal for controlling coil energization. It is a feature. For this reason, the bound of the sector can be reduced, the sector is not affected by the bound of the sector, and the sector can be shifted to the closing operation at an accurate timing, so that highly accurate exposure control can be achieved.
Further, a sector that opens and closes the shutter opening by reciprocating rotation, an actuator that reciprocally rotates the rotor by forward and reverse energization to the coil, and the operating characteristics of the actuator and the sector correspond to the operating characteristics of the sector A memory circuit that stores coil energization data; and a control circuit that controls energization of the coil in accordance with subject brightness and performs exposure control in accordance with the subject brightness. Data for driving the sector, and braking pulse data for applying a force to the sector in the same direction as the certain direction corresponding to the bounding operation in the fully open or fully closed position of the sector, the braking pulse data, It is data for energizing in the same direction as the certain direction during the bounding operation, and the control circuit responds to the subject brightness. Wherein the memory circuit reads out the specific drive data even camera shutter and outputs a control signal for controlling the coil energization can solve the above problems.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The sector that opens and closes the shutter opening by reciprocating rotation, the actuator that rotates the rotor forward and backward by forward and reverse energization to the coil, and the coil energization data corresponding to the operating characteristics of the actuator and sector are stored. A memory circuit, and a control circuit that controls energization of the coil according to subject brightness and performs exposure control according to subject brightness. The energization data includes data for driving a sector in a certain direction, It is set to have braking pulse data that applies a force to the sector in the same direction as the certain direction corresponding to the bounding operation at the stop position, and the control circuit reads specific energization data from the memory circuit according to the subject brightness Thus, a control signal for controlling the coil energization is output.
[0006]
【Example】
An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the stator 9, the rotor 10, and the coil L constitute a swing motor M that is an actuator. The stator 9 is provided with a coil bobbin L 1 around which the coil L is wound. The N pole and the S pole are generated at the pole portions 9a and 9b of the stator 9. By changing the energization direction, the rotor 10 can rotate in both forward and reverse directions.
[0007]
The sectors 23 and 24 driven by the rotation of the swing motor M are disposed symmetrically with respect to the shutter opening 2. The sector 24 is supported so as to be rotatable around a shaft 25 protruding from a ground plate (not shown), and the sector 23 is supported so as to be rotatable around a shaft 22 protruding from the ground plate. A sector opening / closing lever 20 is supported on the upper surface of the sector 23 so as to be rotatable about a shaft 22. The arm 20b of the sector opening / closing lever 20 is provided with a spring 20d to urge the sector opening / closing lever 20 in the clockwise direction. The sector opening / closing lever 20 abuts on a pin 21 provided on the main plate, and further rotation is restricted. A pin 20 a provided at one end of the sector opening / closing lever 20 is engaged with the sector 23 and is engaged with the groove 24 a of the sector 24 to drive the sectors 23 and 24. A fork portion 20c is provided at the other end (lower side of the drawing) of the sector opening / closing lever 20, and is engaged with a pin 11b of the rotor operating lever 11 described later.
[0008]
A rotor operating lever 11 is press-fitted and fixed to the rotating shaft 10 a of the rotor 10, and the rotor operating lever 11 rotates integrally with the rotor 10. A pin 11 b provided at one end of the rotor operating lever 11 is engaged with the sector opening / closing lever 20. For this reason, when the rotor 10 is rotated clockwise, the rotor operating lever 11 is also rotated clockwise, and the rotation of the rotor operating lever 11 causes the sector opening / closing lever 20 to be rotated counterclockwise. , 24 can be activated. The rotor 10 is rotated by a motor drive unit 8 provided in the camera body. The motor drive unit 8 receives energization data from the control circuit 7 and rotates the rotor 10. The control circuit 7 reads information such as film sensitivity information from the ISO information reading circuit 27 and luminance information of the subject from the photometry unit 26 to determine an exposure amount, and energization time for operating the rotor 10 corresponding to the exposure amount. The energization data in the energization direction is read from the memory circuit 5.
[0009]
Next, the operation of such a motor control shutter device will be described. FIG. 1 shows a state before the shutter is operated. First, when the release button 6 of the camera shown in FIG. 2 is pressed, the control circuit 7 energizes the coil L shown in FIG. By energizing the coil L, first, an S pole is generated at the pole portion 9a of the stator 9 and an N pole is generated at the pole portion 9b, and the rotor 10 is rotated in the clockwise direction. Since the rotor operating lever 11 press-fitted and fixed to the rotor 10 by this rotation also rotates clockwise about the shaft 11a, the sector opening / closing lever 20 is counterclockwise by rotating the pin 11b clockwise. Turn in the turning direction. Along with this, the two sectors 23 and 24 rotate in opposite directions via the pin 20a provided in the sector opening / closing lever 20, and an exposure opening begins to be formed.
The sectors 23 and 24 rotate to the exposure position determined by the control circuit 7 based on the luminance information of the subject from the photometry unit 26 shown in FIG. 2 and the ISO information 27 of the film sensitivity, and then reversely energize the coil L. And reverse rotation (counterclockwise rotation) to end the exposure and return to the state of FIG.
[0010]
In this case, energization data for controlling the motor driving unit 8 corresponding to the exposure amount determined by the control circuit 7 is output from the memory circuit 5. That is, the energization data considers the inertia of the rotor 10, the sector opening / closing lever 20, and the sectors 23 and 24. Further, after the sectors 23 and 24 reach the fully open position, energization in the reverse direction is performed immediately before reaching the fully open position so that the bounce caused by the inertia does not occur in the sectors 23 and 24, and then the forward direction is applied. The data is alternately energized in the reverse direction.
[0011]
FIG. 3 explains the energization data to the coil L in correspondence with the opening movement of the sectors 23 and 24. FIG. 3B shows the energization state of the coil L, the horizontal axis indicates the elapsed time, and the vertical axis indicates the energization direction. 3A and 3B correspond to the elapsed time.
As shown in FIG. 3, when the energization of the coil L in the forward direction is started at time t1, the rotor 10 rotates clockwise, and the sectors 23 and 24 are opened as described above (T1 section). A braking pulse is applied to the coil L at a time t2 immediately before the sectors 23 and 24 reach the fully open position (T2 section), and energization in the reverse direction is performed for a short time. For this reason, the sectors 23 and 24 were originally overrun as indicated by the dotted lines, but by reverse direction energization to the coil L, a reverse magnetic field is generated in the magnetic poles 9a and 9b of the stator 9 to force the rotor 10 Act to move statically.
[0012]
Therefore, the sectors 23 and 24 do not overrun as much as the solid line. Thereafter, similarly, at times t3 and t4, braking pulses as shown in FIG. 3 (b) are applied in the forward and reverse directions so as to operate the rotor 10 in the opposite directions in accordance with the movement directions of the sectors 23 and 24, respectively. Alternately energize for a short time. Since the times t2, t3, and t4 are determined for each shutter type and can be set substantially uniformly, the energization data of the memory circuit 5 can be uniformly defined for each shutter type.
[0013]
Further, when the sectors 23 and 24 end the closing operation (T3 section), the rotor 10 and the sectors 23 and 24 are rapidly stopped, so that the same bounce occurs. Therefore, in the present invention, a braking pulse is applied at time t6 immediately before the closing operation (T3 section) by reverse direction energization is completed, and energization is performed for a short time in the forward direction. Thereafter, similarly, a braking pulse is given so as to operate the rotor 10 in the opposite direction in accordance with the movement direction of the sectors 23 and 24, and at the times t7, t8 and t9, the forward and reverse directions as shown in FIG. In addition, power is alternately supplied for a short time. Then, the sectors 23 and 24 should be operated as indicated by dotted lines, but are corrected as indicated by solid lines.
[0014]
In this embodiment, the actuator uses a swing motor, but any actuator that can reciprocate such as a step motor or an ultrasonic motor is applicable. In addition, when the sector was opened, energization was performed to rotate the rotor in the direction opposite to the bounding direction at times t2, t3, t4, and when the sector was closed, t6, t7, t8, t9. Since returning in the reverse direction often becomes a problem, it is possible to apply only a braking pulse for energizing in the advancing direction of the sector at times t3, t7, and t9.
【The invention's effect】
Since the shutter according to the present invention is configured as described above, the extra motion space of the sector scheduled to bounce caused by the opening motion and the closing motion is reduced, and the size of the shutter can be reduced.
In addition, since the sector stabilizes early, when shifting to normal energization for the end of exposure, it is possible to shift the sector to the closing operation at an accurate timing without the influence of the bound of the sector. Exposure control can be achieved.
[Brief description of the drawings]
FIG. 1 is a plan view showing an initial state of a camera shutter according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a camera shutter according to an embodiment of the present invention.
FIG. 3 is a graph showing an opening state and a coil energization state according to an embodiment of the present invention.
[Explanation of symbols]
2 Shutter opening 5 Memory circuit 7 Control circuit 10 Rotor 23, 24 Sector L Coil M Actuator

Claims (2)

往復回動によりシャッタ開口を開閉するセクタと、コイルへの正逆通電によりロータを正逆回転させて前記セクタを往復回動せしめるアクチュエーターと、前記アクチュエーター及び前記セクタの作動特性に対応した前記コイルの通電データが記憶してあるメモリ回路と、被写体輝度に応じて前記コイルへの通電を制御し前記被写体輝度に応じた露光制御を行う制御回路とを備え、
前記通電データは、ある方向に前記セクタを駆動させるデータと、前記セクタの全開又は全閉位置におけるバウンド動作に対応した前記ある方向とは逆方向に前記セクタに力がかかる制動パルスデータとを有し、
前記制動パルスデータは、前記セクタの全開又は全閉位置の直前で、前記ある方向とは逆方向に通電し、その後前記ある方向に通電する正逆方向に交互に通電するデータであり、
前記制御回路は、前記被写体輝度に応じて前記メモリ回路から特定の通電データを読み出してコイル通電を制御する制御信号を出力することを特徴とするカメラ用シャッタ。A sector that opens and closes the shutter opening by reciprocating rotation, an actuator that rotates the rotor reciprocally by forward and reverse energization to the coil, and the coil that corresponds to the operating characteristics of the actuator and the sector. A memory circuit that stores energization data; and a control circuit that controls energization to the coil in accordance with subject brightness and performs exposure control in accordance with the subject brightness.
The drive data is used, the number and data for driving the sector in one direction, and a fully open or fully from the certain direction corresponding to the bound work in a closed position a braking pulse data force to the sector in the opposite direction is applied to the sector And
The braking pulse data is data energized alternately in the forward and reverse directions to energize in a direction opposite to the certain direction immediately before the fully open or fully closed position of the sector, and then energize in the certain direction,
The camera shutter, wherein the control circuit reads out specific energization data from the memory circuit in accordance with the subject brightness and outputs a control signal for controlling coil energization. 往復回動によりシャッタ開口を開閉するセクタと、コイルへの正逆通電によりロータを正逆回転させて前記セクタを往復回動せしめるアクチュエーターと、前記アクチュエーター及び前記セクタの作動特性に対応した前記コイルの通電データが記憶してあるメモリ回路と、被写体輝度に応じて前記コイルへの通電を制御し前記被写体輝度に応じた露光制御を行う制御回路とを備え、A sector that opens and closes the shutter opening by reciprocating rotation, an actuator that rotates the rotor reciprocally by forward and reverse energization to the coil, and the coil that corresponds to the operating characteristics of the actuator and the sector. A memory circuit that stores energization data; and a control circuit that controls energization to the coil in accordance with subject brightness and performs exposure control in accordance with the subject brightness.
前記通電データは、ある方向に前記セクタを駆動させるデータと、前記セクタの全開又は全閉位置におけるバウンド動作に対応した前記ある方向と同一方向に前記セクタに力がかかる制動パルスデータとを有し、The energization data includes data for driving the sector in a certain direction, and braking pulse data for applying a force to the sector in the same direction as the certain direction corresponding to the bound operation in the fully open or fully closed position of the sector. ,
前記制動パルスデータは、前記バウンド動作時に、前記ある方向と同一方向に通電するデータであり、The braking pulse data is data that is energized in the same direction as the certain direction during the bound operation,
前記制御回路は、前記被写体輝度に応じて前記メモリ回路から特定の通電データを読み出してコイル通電を制御する制御信号を出力することを特徴とするカメラ用シャッタ。The camera shutter, wherein the control circuit reads out specific energization data from the memory circuit in accordance with the subject brightness and outputs a control signal for controlling coil energization.
JP26133399A 1999-09-16 1999-09-16 Camera shutter Expired - Lifetime JP4237889B2 (en)

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JP26133399A JP4237889B2 (en) 1999-09-16 1999-09-16 Camera shutter
DE10045155A DE10045155A1 (en) 1999-09-16 2000-09-13 Shutter for camera by using data for driving shutter segments and braking segments based on bounce at stop positions
US09/663,879 US6491450B1 (en) 1999-09-16 2000-09-15 Shutter for a camera

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JP2003075886A (en) * 2001-08-30 2003-03-12 Pentax Corp Shutter controller for camera
JP4328151B2 (en) * 2003-07-30 2009-09-09 セイコープレシジョン株式会社 Shutter for optical apparatus and optical apparatus including the same
CN100476564C (en) * 2003-07-30 2009-04-08 精工精密株式会社 Shutter for optical device, and the optical device with the shutter
JP5734073B2 (en) * 2011-04-19 2015-06-10 キヤノン株式会社 Imaging device
JP6162415B2 (en) * 2013-01-31 2017-07-12 セイコープレシジョン株式会社 Imaging device and focal plane shutter
JP2016182011A (en) * 2015-03-24 2016-10-13 日本電産コパル株式会社 Electromagnetic actuator, blade driving device, and camera

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US3604330A (en) * 1967-09-19 1971-09-14 Compur Werk Gmbh & Co Magnetically driven photographic shutter with braking
JPS55130525A (en) * 1979-03-30 1980-10-09 Canon Inc Bound preventing device of electromagnetical drive shutter
US4408857A (en) * 1982-03-22 1983-10-11 Eastman Kodak Company Method and circuit for controlling an electromagnetic actuator in photographic apparatus
JPH06103373B2 (en) * 1984-03-01 1994-12-14 株式会社精工舎 Program Shutter
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